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Supertanium fasteners have been around forever. In the smaller sizes they are 200ksi. I havent laid eyes on one for several years but I'm sure they are still available.
They are pretty common in maintenance departments of plants. The military used to buy a ton of them too.

Cap Screws

Hi Guys!
I think this is my first post but I read most of the comments. The reading is very interesting. Thanks to all you contributors!
My Premier Fastener Handbook shows the following:
SAE Grade 5 - three lines - 120,000 psi
SAE Grade 8 - six lines - 150,000 psi
Supertanium - special symbol - 160,000 psi
The psi is tensile strength and shear strength is about 60% of the tensile strength.
If you have a Machinery Handbook or similar reference it will have a section on fasteners but when you exceed grade 8 the data is usually from the manufacturer.
Happy Holidays!

Is there a stronger bolt I can use better than a grade 8? What does"AN" desigination mean?

Ok, Im new to this forum so be gentle...

I was looking over this post and saw that no one had mentioned F911 bolts that have ratings up to 180,000 psi. I use F911's in off road applications such as suspension pivot points for a-arms, trailing arms, ect. Normally you can only find these at a "bolt specific" store meaning your local home depot does not carry them. In addition, F911 nuts are only available in pinch nuts not nylocks but you can you grade 8 nylock nuts on them.

If I had a nickle for every time I said "someone once told me"... I would be a rich man. Also consider fine thread grade 8's vs course thread for the side loading strength. Course threads take out up to 25% of the girth on a 1/2" bolt because of the deeper cuts for the treads.

As for AN... I use them but mostly for hydraulics and fuel lines. I have always known them as Army-Navy (someone else told me that also).

Below is a link about F911 bolts. Thanks for the original post because I just found a new place to buy F911's...